<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .box {
        background-color: aqua;
      }
    </style>
  </head>
  <body>
    <div class="box">box</div>
  </body>
  <script src="./jquery.js"></script>
  <script src="./jquery.chsize.js"></script>
  <script src="./jquery.formatdate.js"></script>
  <script>
    console.log(jQuery.prototype === $.fn);
    $(".box").chSize("200px", "200px");
    $(".box").setHtml("这是新内容1")
    console.log($(".box").getHtml());

    document.write($.formatDate("该学习了"));
  </script>
</html>
